May weather forecast
McAllen, TX

May in McAllen, Texas presents the onset of summer as temperatures continue to scale upwards. This period indicates a significant shift in weather while retaining the charm of long daylight hours. The daylight span further extends to 13.4 hours in May, offering ample hours of sunshine. However, May records an increased rainfall of 1.42" (36mm), indicating the start of the rainy season. Despite the rise in temperature and rainfall, May's weather remains well-suited for outdoor activities in McAllen, Texas.

Temperature

McAllen's weather in May displays an average high-temperature of a still hot 91.9°F (33.3°C), showing minor disparity from April's 88.5°F (31.4°C). The average temperature during May nights is registered at a pleasant 73°F (22.8°C).

Heat index

The heat index for May is computed to be a blistering 111.2°F (44°C). Keep alert: Heat cramps and heat exhaustion are probable. Heatstroke is a potential danger with continued physical activity.
Be aware that heat index ratings are designed for shaded locations and minor breezes. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are of high significance for children. In general, younger individuals are at greater risk than adults because they tend to sweat less. Also, having a larger skin surface to body size ratio and greater heat production due to their active behavior contribute to this danger.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. In the presence of abundant moisture in the atmosphere, the cooling process through evaporation is hindered, causing the body to feel excessively warm. Should the body fail to balance its heat gain, the escalating temperature poses health challenges.

Humidity

The most humid month in McAllen is May, with an average relative humidity of 68%.

Rainfall

In McAllen, in May, it is raining for 9.3 days, with typically 1.42" (36mm) of accumulated precipitation. In McAllen, during the entire year, the rain falls for 103.3 days and collects up to 12.72" (323mm) of precipitation.

Snowfall

February through December are months without snowfall in McAllen.

Daylight

In May, the average length of the day in McAllen is 13h and 26min.
On the first day of May, sunrise is at 6:54 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 8:20 pm CDT.

Sunshine

The average sunshine in May is 10h.

UV index

In McAllen, Texas, the average daily maximum UV index in May is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 7 in May interprets into the following advice:
Deter overexposure. Protecting against the sun's effects is essential. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.